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The specific conditions associated with SVFR clearances in each control zone are published in the UK AIP (AD 2 Section) for individual aerodromes.
Special VFR is permitted in the UK at night. However, in general terms, SVFR is a specific clearance within the Instrument Flight Rules, and pilots should treat any such clearance as merely relaxing the requirements to fly as IFR rather than being an extension of VFR. In any case, an SVFR clearance can only be given if traffic and controller workload allows.
Without prejudice to existing weather limitations on Special VFR flights at specific aerodromes (as detailed within the AD 2 Section) ATC will not issue a Special VFR clearance to any fixed-wing aircraft intending to depart from an aerodrome within a Control Zone, when the official meteorological report indicates that the visibility is 1800 m or less and/or the cloud ceiling is less than 600 ft.
Aircraft using the access lanes and local flying areas notified for Denham, White Waltham and Fairoaks in the London CTR, and any temporary Special Access Lanes which may be notified from time to time, will be considered as Special VFR flights and compliance with the procedures published for the relevant airspace will be accepted as compliance with an ATC clearance. As such, flight plans are not required to be filed and separate requests should not be made nor will separate clearances be given. Separation between aircraft, which are using such airspace, cannot be given, and pilots are responsible for providing their own separation from other aircraft in the relevant airspace.
A diagram detailing the VFR Flight Planning Process can be found in the ENR section 1.10.
12. Low-Level Civil Aircraft Notification Procedures (CANP)
Introduction
Many military and civil aircraft operate in Class G Airspace below 2000ft AGL, where ground radio and radar coverage is not always available to assist pilots in avoiding collisions. Collision avoidance must necessarily, therefore, be based on the 'see and avoid' principle, assisted as far as possible by information on known activity. Whereas a variety of civil aviation activities take place within this airspace, military activity consists mainly of low flying training.
It is not practicable to obtain and disseminate traffic information on all civil flights below 2000ft AGL, nor is it possible to disseminate details of military low level flights within the UK Low Flying System (UKLFS) to civil operators. Nevertheless, the greatest conflict of interests occurs at or below 1000ft AGL where the majority of military low level operations take place and where civil aircraft may be engaged upon activities, as defined at paragraph below and overleaf, which might inhibit pilot look-out or reduce aircraft manoeuvrability. In addition, certain recreational and other civil flying activity, away from licensed aerodromes, needs to be considered.
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本文链接地址：Guide to Visual Flight Rules (VFR) in the UK(43)
